[Q] Flashing CM 10.2 over Gingerbread stock ROM?

Hey guys, I recently flashed my Ace II to CM 10.2 and it's working perfectly, but there is just one thing...I don't have any mobile connection which is kinda odd. I have searched to some previous threads and read a reply how I can't flash the CM 10.2 over my original Gingerbread. Is that right and could that be the cause of my network problem since the phone is not showing my phone number or anything that has to do with the SIM card. If that is the problem how do I fix it? Do I need a JB firmware, can I get one here and is any JB firmware for GT I8160 safe for my phone?

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